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MORGAN HEBARD 319
THE JANEIRENSIS GROUP OF THE GENUS EUBORELLIA,
WITH THE DESCRIPTION OF A NEW SPECIES
BY MORGAN HEBARD
While at Miami, Florida, early in 1919, the, author again
visited the mangrove swamp on the border of Brickeirs Ham-
mock, for the purpose of securing additional material of several
interesting species of Orthoptera which, in 1915, had been found
therein, — i. e. Hygronemobius alleni (Morse), Anaxipha scia Heb-
ard and Anaxipha imitator (Saussure.) 1 While searching for spec-
imens of the second species, about the mangrove shoots which
projected from the muck and tidal litter, some of the latter
was overturned and a specimen of Euborellia revealed. This indi-
vidual soon was seen to be different from annulipes (Lucas),
the only species of the genus hitherto known from the United
States, and vigorous efforts were vainly made to find other exam-
ples. Several days later the spot was revisited and yards of the
litter carefully lifted and sifted. Hours of such work result-
ed in our securing five males, three females and several immature
specimens of the species. These were found under seaweed and
sea-grass, drifted in to the edge of the normal high tide, us-
ually between the lower matted layers, near the wet, mucky
ground. The species was local, but never in colonies, as is us-
ual for Anisolabis maritima (Gene), two specimens of which were
found in the same place. The area in which the species occurred
is shown in the accompanying illustrations (pi. XVIII, figs. 1
Comparison of this material with a female of Euborellia
ambigua (Borelli), 2 from Santa Maria de Dota, Costa Rica,
shows full agreement. Further comparison of material con-
vinces us that the West Indian series, recorded by Rehn and
Hebard as E. ambigua, represents a distinct, though very closely
1 Recorded in Ent. News, xxvi, pp. 463, 465 and 466, (1915).
2 Recently received from Borelli, in exchange, by the Academy of Natural
Sciences of Philadelphia.
TRANS. AM. ENT. SOC, XLVII.
320 JANEIRENSIS UKOUP OK GENUS EUBOKELLIA (dEKMAFTEKa)
These species, with the South American Euborellia janeirensis
(Dohrn), show a distinctive type of tegminal development, in
which the aborted rounded tegmina cover all of the mcsonotum
except the small median scutellar area, or all but a narrow
median portion of the mesonotum. We refer them to what
we term the Janeirensis Group. This type of tegmina in some
respects resembles that developed in the Indian species Para-
labis castetsi (Bolivar) and Epilabis penicillata (Borelli). Those
species, however, have the tegmina much more transverse, with
cephalic margins parallel to, and separated a distance from, the
caudal margin of the pronotum, so that a narrow cephalic
marginal portion of the metanotum is exposed, giving the ap-
pearance of a very broad, but shallow, scutellar area.
In order to avoid further confusion, we give, in the accompany-
ing key, the more striking features of difference between the
American species under consideration, following them with such
additional data as is considered of value.
Key to the Speeies of the Janeirensis Group
A. Seventh to ninth abdominal tergites of male with latero-caudal
angles sharply acute-angulate produced, weakly keeled and weakly rugulose.
(Eighth and ninth abdominal tergites of female with latero-caudal angles
roundly angulate produced, showing weak traces of keels distad.) Male
forceps more distinctly bowed, as in Euborellia moesta (Gene) or the type of
extreme specialization developed in annulipes] female forceps longer and
more slender. Limbs unicolorous. (Antennae not annulate.) Caudal meta-
tarsus no longer than combined length of the succeeding tarsal joints. (Size
averaging large 3 , 12. 7 4 to 14 5 mm.). (Southern Florida and Costa Rica.)
AA. Sixth to ninth abdominal tergites of male with latero-caudal angles
very sharply acute-angulate produced, distinctly keeled and rugose. Male
forceps weakly bowed, as is usual in annulipes; female forceps shorter and
heavier. Limbs not unicolorous. Caudal metatarsus slightly but dis-
tinctly longer than combined length of succeeding joints.
3 Unless qualified the length given by us for Dermaptera is always that
of the body, exclusive of the forceps.
4 This is from the Costa Rican specimen before us; all of the Florida in-
dividuals are larger.
5 A body length of 16 millimeters is given in the original description.
MOKC'iAN HE BAUD 321
B. Antennae not annulate. Eight and ninth abdominal tergites of fe-
male with latero-caudal angles rounded and rarely showing any trace
of keel. Femora with external faces broadly washed with brown, this
often weak; internal faces similarly washed with brown, this weaker and
less extensive. Tibiae with ventral surface normally very weakly ting-
ed with brown; this, when conspicuously developed, extending to near
distal extermity. Size averaging small, 8.2 to 11.7 6 mm. (West
Indies.) caraibea new species
BB. Antennae annulate. Eighth and ninth abdominal tergites of
female with latero-caudal angles roundly angulate produced and show-
ing very weak keels. Femora with median portion of external faces
suffused with brown, corresponding portion of internal faces usually with
a suffused patch of this color. Tibiae weakly tinged with brown proxi-
mad. Size averaging larger, 11.5 to 12.5 mm. (South America.)
Euborellia ambigua (Borelli) (Plate XIX, figures 1, 2 and 3.)
1906. Anisolabis ambigua Borelli, Boll. Mus. Zool. Anat. comp. Univ.
Torino, xxi, no. 531, p. 3. [ 9 ', Hio Jesus Maria, in mangrove region,
Santa Maria do Dota, Cos la Rica, 1 9, [A. N. 8. P.l.
BriekeH's Hammock, Miami, Florida, II, 28 and III, G, 11)19,
(M. Hebard; in mangrove swamp), 5a 71 , 3 9,1 juv., [Hebard
The hitherto unknown male sex of this species may be readily
recognized by the figures and the characters given in the key.
In ambisexual features it agrees closely with Borelli 's adequate
description of the female. We would note, however, that the
pronotum, though widening evenly caudad, is there not as wide
as the width of the head across the eyes. Borelli has stated
"Pronoto . . . posteriormente di larghezza uguale a quella
At the coastal localities where it has been found the species
is known only from mangrove swamps. It will probably be
found to have a wide distribution in that environment, when
such situations, difficult of access and usually harboring swarms
of mosquitoes, have been more extensively and carefully ex-
6 Length of body, including forceps, of this largest specimen, from Porto
Rico, 13.5 mm.
TRANS. AM. ENT. SOC., XLVII.
322 JANEIRENSIS GROUP OF GENUS EUBORELLIA (dERMAPTERa)
Euborellia caraibea new species (Plate XIX, figures 4, 5 and 6.)
1917. Euborellia ambigua Rehn and Hebard (not Anisolabis ambigua Borelli,
1906), Bull. Am. Mus. Nat. Hist. ; xxxvn, p. 638. [9, cf ; Nassau, New
Providence Island, Bahamas; Jesus del Monte, Cuba; Stony Hill and
Montego Bay, Jamaica; Roseau, Dominica.]
Previous to the records noted above, incorrectly referred to
ambigua, material of the species had been recorded at different
times as annulipes and janeirensis. Specimens of caraibea from
Porto Rico are in the Philadelphia Collections, while Borman's
record of janeirensis from St. Vincent 7 is almost certainly ref-
erable to this species.
The most important features of difference between caraibea
and its nearest allies are given in the accompanying key, and
are shown by the figures. The following additional characters
Type. — d"; Nassau, New Providence Island, Bahamas. Feb-
ruary 3, 1914. (M. Hebard.) [Hebard Collection, Type no.
Form moderately stout, as in janeirensis, slightly heavier than in ambigua.
Antennae with longest distal joints not over twice as long as wide, in janeirensis
about two and one-half times as long as wide, in ambigua fully three times
as long as wide. Pronotum with length equal to width as in janeirensis,
slightly shorter than in ambigua. Abdomen generally impresso-punctulate,
this slightly heavier than in janeirensis; in ambigua the abdomen is almost
smooth, showing much finer impressed punctulations laterad and distad.
Ultimate abdominal tergite with a distinct, impressed, medio-longitudinal
line; the surface slightly more tumid laterad than in janeirensis and ambigua.
Forceps much as in males of janeirensis; short, stout, triquetrous proximad,
straight to the incurved apices, the sinistral arm being less strongly incurved
distad than the dextral arm, internal margin bluntly subserrulate. Penul-
timate abdominal sternite triangularly produced, with apex rather broadly
Allotype. — 9 ; same data as type. [Hebard Collection.]
Agrees with male in features given above, except as follows. Ultimate
abdominal tergite showing weak convexity dorso-laterad. Forceps much as
in females of janeirensis; shorter than in male, stout, triquetrous proximad,
straight to the weakly incurved apices, the sinistral and dextral arms being
incurved to an equal degree, the nearly attingent ventro-internal margins
slightly more coarsely but as bluntly subserrulate as in male.
The measurements of the type and allotype are as follows. Length of
body, d 1 10.2, 9 10.3; length of pronotum, cT 1.43, 9 1.56; caudal width of
pronotum, d 71 1.43, 9 1.56; length of tegmen, tf 1.16, 9 1.29; width of tegmen,
7 Proc. Zool. Soc. London, 1892, p. 201, (1892).
MORGAN HEBARD 323
d 1 .88, 9 .98; length of forceps, cf 1.9, 9 2.24; greatest (proximal) width of
arm of forceps, d 71 .79, 9 .85 mm.
General coloration shining, blackish with an auburn tinge. Antennae
auburn, the proximal joints very slightly paler. Limbs warm buff, marked
as described in key.
In addition to the type and allotype, a pair bearing the same
data, in the Hebard Collection, and a female, from the same
locality, taken in the spring of 1904, by W. M. Wheeler, in the
Academy of Natural Sciences Collection, are designated para-
The following previously unrecorded material is before us :
Cape Haitien, Hayti, (W. M. Mann), 1 9 , [Mus. Comp. Zool.].
Momance, Hayti, XI, 1912, (W. M. Mann), 1 9 , [Hebard Cln.].
St. Marc, Hayti, I, 1913, (W.M.Mann), 1 d\ [Mus. Comp.
Arecibo, Arecibo, Porto Rico, VII, 30 to VIII, 1, 1914, (Lutz,
Mutchler, Watson; under bark of rotten stump and under logs),
1 cf , 1 9 , [Acad. Nat. Sci. Phila.].
Utuado, Arecibo, Porto Rico, (W. M. Wheeler), 1 d\ 3 9,
[Amer. Mus. Nat. Hist.].
Banos de Coamo, Ponce, Porto Rico, (W. M. Wheeler), 1 c?,
2 9,3 juv., [Amer. Mus. Nat. Hist.].
Aibonito, Ponce, Porto Rico, VI, 1 to VII, 17, 1914 and 1915,
(Lutz, Mutchler, Barber; in rotten logs), 1 d\ 2 9 , [Amer. Mus.
Port of Spain, Trinidad, III, 4, 1910, 1 cf, [Acad. Nat. Sci. Phila.]
The last is the southernmost locality known for the species.
Euborellia janeirensis (Dohrn)
1864. F [or cinella] janeirensis Dohrn, Stettin Ent. Zeit., xxv, p. 285. [d";
Rio de Janeiro, Brazil.]
Two males and three females from Gear a Mirim, Rio Grande
do Norte and Independencia, Parahyba, Brazil, correctly re-
corded as this species by Rehn, 8 have been used as the basis
for the comparisons made in the present paper.
« Trans. Am. Ent. Soc, xlii, p. 218, (1916).
TRANS. AM. ENT. SOC, XLVII.
324 JANEIRENSES GROUP OF GENUS EUBORELLIA (dERMAPTERA)
Explanation of Plates
Mangrove swamp on edge of Brickell's Hammock, Miami, Florida. Habi-
tat of Euborellia ambigua, Hygronemobius alleni, Anaxipha scia and other
Fig. 1. — Looking into swamp from seaward border. Tidal litter shown
in foreground, beneath which Euborellia ambigua occurred.
Fig. 2. — Seaward border of swamp, looking out toward Biscayne Bay from
the same spot shown in figure 1. The mangrove shoots shown in the lower
right-hand corner were the preferred habitat of Anaxipha scia, while beneath
the tidal litter at their bases Euborellia ambigua was found.
Fig. 1. — Euborellia ambigua (Borelli). Brickell's Hammock, Miami
Florida. Dorsal outline of male. ( X 3)
Fig. 2. — Euborellia ambigua (Borelli). Brickell's Hammock, Miami,
Florida. Lateral view of distal portion of male abdomen. (X 4)
Fig. 3. — Euborellia ambigua (Borelli). Brickell's Hammock, Miami.
Florida. Dorsal view of distal portion of female abdomen. ( X 4)
Fig. 4. — Euborellia caraibea new species. Nassau, New Providence Island,
Bahamas. Type. Dorsal outline of male. (X 3)
Fig. 5. — Euborellia caraibea new species. Nassau, New Providence Island,
Bahamas. Type. Lateral view of distal portion of male abdomen. ( X 4)
Fig. 6. — Euborellia caraibea new species. Nassau, New Providence Island,
Bahamas. Allotype. Dorsal view of distal portion of female abdomen.
Trans. Am. Ent. Soc. Vol. XL VII.
HEBARD— GENUS EUBORELLIA